"Court proceedings in Saudi Arabia fall far short of international standards for fair trial and news of these recent multiple executions is deeply disturbing," said Hassiba Hadj Sahraoui, the group's Middle East director.

"The Saudi authorities appear to have increased the number of executions in recent months, a move that puts the country at odds with the worldwide trend against the death penalty," he said in a statement.

The organisation pointed out that majority of those executed recently in Saudi Arabia were workers from poor countries.

Most of the defendants have no defence lawyer, have insufficient hold of the Arabic language to follow proceedings and in many cases they are not informed of the progress of legal proceedings against them, it said.

They also have no access to influential figures or money, both of which might have secured them pardons. Saudi Arabia applies the death penalty for a wide range of offences, the web news portal said quoting the statement.

The beheadings bring the number of executions in Saudi Arabia this year to 58, more than double than the 2010 figures. Twenty of those executed this year were foreign nationals.